Accession Number : ADD006633

Title :   Method and Apparatus for Driving an Optical Waveguide with Coherent Radiation.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Redman,Charles M

Report Date : 03 Oct 1978

Pagination or Media Count : 8

Abstract : A method and apparatus for driving an optical waveguide with a coherent source of radiation is described. The apparatus includes means for providing a relatively high level of continuous wave (cw) coherent optical/infrared radiation in a closed waveguide, preferably traveling in one direction, means for scattering the optical radiation out of the closed waveguide, and means for collecting the scattered radiation in an adjacent waveguide for transmission to distant points. the cw coherent radiation is preferably generated within a single-frequency traveling-wave multi-turn Nd:YAG laser. A first waveguide is coupled at the ends to form a multi-turn laser of a closed loop system. The scattering means includes means for impressing a microwave modulating signal onto the first waveguide at the Bragg angle which serves to set up an effective optical grating within the first waveguide for scattering the laser beam. The second or output waveguide is positioned with respect to the scattered beam for intercepting same to travel along its optical axis. In a preferred embodiment, the second waveguide is potted in a parallel relationship with the first waveguide and includes an inclined end surface for redirecting the scattered radiation along its optical axis. (Author)

Descriptors :   *Patents, *Optical waveguides, *Laser pumping, Bragg angle, Neodymium lasers, Light scattering, Frequency modulation, Microwaves, Interactions, Closed loop systems

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE